If you don't have a planer I would look into a belt sander. A bit tricky, but worth learning...I've got a teeny tiny little shop and am in the early days of kitting it out. We've got a table saw, a mitre saw, an orbital sander, and some hand tools. I don't know that we're ever going to have room for a joiner, and while I'd love a benchtop planer we don't have that at the moment either.
I'm doing a bunch of glue-ups of fancy patterned hardwood, but need to get them perfectly flat — how would you smooth out your stock if you didn't have a joiner or planer? (Honestly the idea of using a hand plane on them makes me feel a little ill, but I'm open to learning how to do that if that's the best/only way! 😅)